不同空隙结构沥青混合料生态效能的研究

Research on Ecological Efficiency of Asphalt Mixture with Different Porosities

多孔沥青混合料具有改善生态、热环境、光环境、防洪、吸声降噪和提高行车安全等优势,但不同空隙结构沥青混合料对径流污染控制和温度的调节功能还不明确。因此,重点研究不同空隙结构沥青混合料的热物参数,并通过室内模拟太阳辐射试验系统,研究不同空隙结构沥青路面内部温度变化规律,得出增大沥青混合料的空隙率,能够降低其导热系数,从而降低沥青路面内部的温度;同时在明确径流污染主要评价指标的基础上,研究了不同空隙结构沥青混合料控制径流污染的效果,进而明确了不同空隙结构沥青混合料的热阻和控制径流污染效能。最后,从透水、承载、耐久和生态效能综合考虑,建议多孔沥青混合料的有效空隙率应为15%~20%,为今后设计出生态环保型透水路面提供依据。

The porous asphalt mixture has several advantages such as retrofitting ecology, heat environmental,luminous,heat island effect,preventing floods and noises,and improving the safety of motorists,but it is not clear how asphalt mixtures with different air void structures in the efficiency of controlling runoff pollutant and adjusting the temperature. We studied the thermal physical parameters of asphalt mixtures with different air void structures,and studied the variation of temperature at the different depth of these mixtures depending on an in-door test system which simulates solar radiation. The increase of porosity of asphalt mixture can reduce its thermal conductivity and reduce the temperature in asphalt mixtures. Meanwhile,on the basis of identifying the main evaluation indicators of runoff pollution,we also studied the controlling efficiency of runoff pollutant by porous asphalt with different air voids,and clarified the efficiency of controlling runoff pollutant and heat resistance. It is suggested that the effective porosity of the mixtures should be 15%- 20% to be a basis in designing the eco-friendly porous asphalt mixture.